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All Journal Buletin Pos dan Telekomunikasi Komputasi: Jurnal Ilmiah Ilmu Komputer dan Matematika Jurnal Sains Dirgantara
Prayitno Abadi
Telkom University BRIN-LAPAN
Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Social Sciences Transportation

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Design of Sliding Correlator Channel Sounder for Ionospheric Channel Probing Based on Software Define Radio Varuliantor Dear; Adi Purwono; Iskandar Iskandar; Adit Kurniawan; Prayitno Abadi
Buletin Pos dan Telekomunikasi Volume 19 Issue 1 (2021)
Publisher : Centre for Research and Development on Resources, Equipment, and Operations of Posts and I

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17933/bpostel.2021.190101

Abstract

Observation of wireless channel using channel sounder method is needed in order to obtain the channel characteristics in the form of delay spread (Tm) and doppler spread (fD) parameters for optimizing the design of digital communication systems. This also applies to the ionosphere channels which are known to have dynamic properties in the time and place domains. The Sliding Correlator Channel Sounder technique known as a popular technique due to the advantage in the low level of complexity and relatively low cost. Similar to the advantages of the sliding correlator technique, Software Define Radio (SDR) device is one of the popular inexpensive platforms for implementing the communication system into the real world. The implementation of the sliding correlator channel sounder technique in the SDR platform will increase the advantages of the ionosphere channel measurement system that needed as an effort to obtain the dynamic of ionospheric channel characteristic information. However, the process of implementing a sliding correlator channel sounder system into the SDR device requires precise calculations to guarantee the designed system able to works according to the specifications of the SDR device and also meet the system performance targets. This paper discusses the design of a sliding correlator channel sounder system for observing the characteristics of ionosphere channels using SDR devices. The system design starts with the process of calculating the clock frequency generator bit (fchirp) based on the system performance target which refers to the recommendation of the ionospheric channel characteristics based on ITU-R F.1487 documents. Parallel with the calculation of the fchirp, the calculation of the Pseudo Noise (PN) bit length (L) based on the Dynamic Range (DR) value that meets with the specifications of the SDR hardware also carried out. Based on the obtained fchirp and L values, the calculation of other sliding correlator channel sounder parameters is performed with a limitation of a hardware specification and the target system performance. MATLAB simulation results show that the expected system performance can be met. This systems can also be realized significantly through the results of real signal transmission experiments conducted in a closed room laboratory
ANALISIS DISTRIBUSI SPASIAL DAN TEMPORAL SINTILASI IONOSFER KUAT DI ATAS INDONESIA SELAMA EKUINOKS 2013 [ANALYSIS OF SPATIAL AND TEMPORAL DISTRIBUTION OF STRONG IONOSPHERIC SCINTILLATION OVER INDONESIA DURING EQUINOX 2013] - Asnawi; Prayitno Abadi; Sri Ekawati; Dessi Marlia
Jurnal Sains Dirgantara Vol 12, No 2 (2015)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1066.731 KB)

Abstract

Ketidakteraturan ionosfer daerah ekuator magnetik mempunyai kecenderungan karakteristik yang khas terkait fenomena gelembung plasma dan Equatorial spread F (ESF). Fenomena tersebut terjadi akibat ketidakstabilan plasma setelah matahari terbenam sehingga terjadi gradien kerapatan elektron yang memicu munculnya sintilasi ionosfer. Informasi gangguan sintilasi temporal dan spasial diperlukan untuk mitigasi dampaknya terhadap sistem telekomunikasi dan navigasi. Untuk analisis spasial dan temporal kemunculan sintilasi ionosfer wilayah Indonesia dilakukan pemetaan dengan teknik interpolasi tetangga terdekat (nearest neighbour). Data indeks amplitudo sintilasi ionosfer (S4) yang digunakan diperoleh dari lima stasiun pengamatan yaitu Kototabang, Bandung, Pontianak, Manado, dan Kupang untuk periode 2013. Hasil pemetaan sintilasi ionosfer menunjukkan evolusi kemunculan sintilasi secara spasial yang hampir merata di seluruh wilayah dan terindikasi bergerak ke arah barat. Indikasi pergerakan kemunculan ini disebabkan pergerakan batas waktu terbenam matahari yang bergerak ke arah barat. Secara temporal, diperoleh data kemunculan yang lebih sering pada sore hari hingga tengah malam terutama pada bulan ekuinoks yaitu Maret-April dan September-Oktober.Kata kunci: Ionosfer, Sintilasi, Interpolasi Tetangga terdekat
The Effect of Force Ratio Multiplier on A Control System for Surfing Problem Simulation Reza Rendian Septiawan; Agus Virgono; Umar Ali Ahmad; Prayitno Abadi; Mas'ud Adhi Saputra
Komputasi: Jurnal Ilmiah Ilmu Komputer dan Matematika Vol 19, No 2 (2022): Komputasi: Jurnal Ilmiah Ilmu Komputer dan Matematika
Publisher : Ilmu Komputer, FMIPA, Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/komputasi.v19i2.5260

Abstract

A surfing problem is a control problem of the surfing board to maintain its position on top of an ocean wave as long as possible. There are some physical and mathematical problems regarding a surfing problem that have not yet been solved. One of them is on translating a target inclination problem from an ordinary differential equation (ODE) control system to the inclination control system via the distribution of a surfer’s weight. To move the surfing board swiftly, a correct value of the multiplier, which is notated by σ, is needed on the weight distribution system. In this work, an investigation has been done on the effect of the multiplier in an attempt to help moves the surfing board fulfils the target inclination angle needed by using a smoothed particle hydrodynamics (SPH) simulation. The result from this work shows that the best value for the multiplier is σ=10 that gives the smallest average positional error for some variations of a given target position. This work gives a contribution on an attempt to model a surfer’s phenomenon mathematically.
Co-Authors - Asnawi Adi Purwono Adit Kurniawan Dessi Marlia Iskandar Iskandar Mas'ud Adhi Saputra Reza Rendian Septiawan Sri Ekawati Umar Ali Ahmad Varuliantor Dear